Meaning of the word "self possessed" in English

What does "self possessed" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

self possessed

US /ˌself-pəˈzest/
UK /ˌself-pəˈzest/

Adjective

having or showing control of one's feelings, behavior, or reactions; composed

Example:
Despite the chaos, she remained calm and self-possessed.
His self-possessed demeanor impressed everyone in the room.